ESLint

https://eslint.org/docs/user-guide/getting-started

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$ npm install -g eslint

$ eslint --init

.eslintrc

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{
"env": {
"browser": true,
"es6": true
},
"extends": "eslint:recommended",
"parserOptions": {
"ecmaVersion": 2015
},
"rules": {
"indent": [
"error",
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],
"linebreak-style": [
"error",
"unix"
],
"quotes": [
"error",
"single"
],
"semi": [
"error",
"never"
]
}
}
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